Have you checked this with the web inspector (Tools → Developer Tools)? Also, this happens when you are logged in or logged out of Google?
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AlexAug 19 '12 at 12:03

It happens in both cases: I loaded the site in an incognito wondow and the problem remains. What should I chek with the web inspector?
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Alessandro CuttinAug 19 '12 at 12:30

Do you have some privacy extensions installed on Chrome? Looks like a Twitter gadget, right? If you have any privacy extension installed, it might be the culprit. Have you checked the site from different machines?
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AlexAug 19 '12 at 12:40

Same problem on a different machine with the newest version of chrome. The fact is: in older versions of chrome, those items were recognized as non secure, and a pop-up asked if I wanted to load them, or not. Now there's no warning and they are not loaded
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Alessandro CuttinAug 19 '12 at 19:01